Research project undertaken by the students of Saraswati School about variety of species in Thane creek has revealed that 19 varieties of fish have disappeared from Thane creek. The project informs that previously there were 19 fish varieties seen in Thane creek. Rawas, Pakat, Hekru, Karkara, Makul, Jitad, prawns (Kolambi), Mushi, Shingada and many other varieties have vanished from the water of Thane creek. Previously, fishing was a major business for locals. There were 15 spots where fishermen used to fix their fishing nets, but now it has drastically reduced and one can hardly see such fishing net. Due to severe water pollution fishermen have been catching prawns that have turned black from inside and those who have eaten them often complain about bad chemical smell emitting from them. This had lead to a decrease in the level of fishing in Thane Creek. The project also notes that the fishermen are using wrong fishing methods. The students also registered that the market of salt-water fish is far larger than fresh-water fish. Notably, about 65 per cent people select fish according to their preferences, while 35 per cent buy according to the availability and price of the fish in the market. Neither the fish vendor nor the customers have any idea that rotten and waste fish can be utilised as manure. While concluding the project report the students have stated that black prawns are the proof of water pollution, which is due to large amount of plastic bags, Nirmalya and other waste found in Thane Creek. Species in sea are getting extinct at a speed double than that on land. Wastewater, chemicals from factories and plastic are polluting the water to such high levels that it causes a threat to the species in water. In recent years, huge trailers are used for fishing flourishing fishing business. The project also suggests that since there are many species dependent on sea and the greenery surrounding it, we should preserve the mangrove. It's a good sign that students have developed genuine interest in such researches and are working hard on their projects.